An Etymological Dictionary of the German Language/Annotated/zwier
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zwier, adverb, ‘twice,’ earlier Modern High German, from the equivalent Middle High German zwir, Old High German zwirôr, zwiro; compare Old Icelandic tysvar, tvis-var (-var corresponding to Sanscrit vâra, ‘time’). Old High German drirôr, ‘thrice,’ is similarly formed.